8- and 4-Channel, 3 ꢀ ꢁREF
Multirange Inputs, Serial 14-Bit ADCs
2/MAX103
Pin Description (continued)
PIN
NAME
FUNCTION
MAX1032 MAX1033
Analog Supply Voltage 2. Connect AVDD2 to a 4.75V to 5.25V power-supply voltage. Bypass
AVDD2 to AGND2 with a 0.1µF capacitor.
22
19
AVDD2
Analog Ground 2. This ground carries approximately five times more current than AGND1.
DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.
23
24
20
1
AGND2
AGND1
Analog Ground 1. DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.
5.0V
5.0V
5.0V
0.1µF
0.1µF
0.1µF
AVDD2
CHO
AVDD1
DVDD
3.3V
CH1
DVDD0
V
DD
4–20mA
PLC
CH2
0.1µF
MC68HCXX
CH3
ACCELERATION
PRESSURE
µC
CH4
CH5
SCLK
CS
SCK
I/O
TEMPERATURE
WHEATESTONE
WHEATESTONE
MAX1032
CH6
CH7
DIN
MOSI
I/O
REF
SSTRB
DOUT
AGND1
REFCAP
AGND2
MISO
1µF
V
SS
AGND3 DGND DGNDO
0.1µF
Figure 1. Typical Application Circuit
(µP) control is made easy through an SPI-/QSPI-/
MICROWIRE-compatible serial interface.
Detailed Description
The MAX1032/MAX1033 multirange, low-power, 14-bit
successive-approximation ADCs operate from a single
+5V supply and have a separate digital supply allowing
digital interface with 2.7V to 5.25V systems. These 14-bit
ADCs have internal track-and-hold (T/H) circuitry that
supports single-ended and fully differential inputs. For
single-ended conversions, the valid analog input voltage
The MAX1032 has eight single-ended analog input
channels or four differential channels (see the Block
Diagram at the end of the data sheet). The MAX1033 has
four single-ended analog input channels or two differential
channels. Each analog input channel is independently soft-
ware programmable for seven single-ended input ranges
(0 to (3 x V
REF
three differential input ranges ( 3 x V
)/2, (-3 x V
)/2 to 0, 0 to 3 x V
, -3 x
) and
REF,
REF
to 0, ( 3 x V
REF
)/4, ( 3 x V
REF
range spans from -3 x V
below ground to +3 x V
REF
REF
V
)/2 3 x V
REF
REF ,
REF
above ground. The maximum allowable differential input
voltage spans from -6 x V to +6 x V . Data can be
)/2, 3 x V
REF
6
REF
REF
x V
. Additionally, all analog input channels are fault tol-
REF
converted in a variety of software-programmable chan-
nel and data-acquisition configurations. Microprocessor
erant to 16.5V. A fault condition on an idle channel does
not affect the conversion result of other channels.
______________________________________________________________________________________ 13
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
